package com.example.demo.config;

import com.example.demo.common.AppVariable;
import com.example.demo.entity.Userinfo;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


public class LoginInterceptor implements HandlerInterceptor {


    /*
    * true -> 用户已登录
    * false ——> 用户未登录
    * */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession(false);
        if (session!=null && session.getAttribute(AppVariable.USER_SESSION_KEY)!=null){
            //用户已登录
            System.out.println("当前登录用户为："+
                    ((Userinfo)session.getAttribute(AppVariable.USER_SESSION_KEY)).getUsername());
            return true;
        }

        //跳转到登录页面
        response.sendRedirect("/login.html");
        return false;
    }
}
